A long time ago, I in the USA for two years.
_____ on facts, the report should be reliable(可靠的).
There were so many people in the street watching the fire that the firefighters could not get _____ to the building on fire as soon as possible.
Her face went red _____ he had said.
The teacher asked an easy question, but not a proper answer _____.
When Li Ming got to America, he found his English was quite different _____ he had learned in China.